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q in (-oo:+oo)
1/2 = 4*q // - 4*q
1/2-(4*q) = 0
1/2-4*q = 0
1/2-4*q = 0 // - 1/2
-4*q = -1/2 // : -4
q = -1/2/(-4)
q = 1/8
q = 1/8
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